Calculate the number of years between the earliest and latest order dates in the orders table.
CREATE TABLE orders (order_id INTEGER, order_date DATE); INSERT INTO orders (order_id, order_date) VALUES (1, '2010-01-01'), (2, '2020-01-01'), (3, '2023-01-01');
```sql
SELECT 
    EXTRACT(YEAR FROM (MAX(order_date) - MIN(order_date))) AS years_difference
FROM 
    orders;
```
```sql
SELECT 
    EXTRACT(YEAR FROM (MAX(order_date) - MIN(order_date))) AS years_difference
FROM 
    orders;
```